linux-kernel - Re: need help to clear kernel (2.6.16.17) cached memory

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Date:	Sun, 14 Dec 2014 18:49:51 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Manish Yadav <kmanish.ixp@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: need help to clear kernel (2.6.16.17) cached memory

Hi,

On Sat, 13 December 2014 Manish Yadav <kmanish.ixp@...il.com> wrote:
> on my system (based on 2.6.16.17), i am trying to clear the cached
> memory but it is not being cleared.
> 
> mars# free -m
>              total       used       free     shared    buffers     cached
> Mem:           925        459        465          0          0        231
> -/+ buffers/cache:        228        697
> Swap:            0          0          0
> mars# sync && echo 3 > /proc/sys/vm/drop_caches
> M1450-mrakesh# free -m
>              total       used       free     shared    buffers     cached
> Mem:           925        459        466          0          0        231
> -/+ buffers/cache:        227        697
> Swap:            0          0          0
> mars#
> 
> could you please let me know what i am missing here? as per my
> investigation writing 3 to drop_caches should clear the cached memory.

Any tmpfs around that would be filled with the remaining cached data?

> thanks,
> manish

Cheers,
Bruno
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